Diagnosing & Fixing P0562 System Voltage Low in a 2013-2016 Toyota Land Cruiser

Introduction

Imagine this: You’re driving your 2013-2016 Toyota Land Cruiser 5.7L V8, and suddenly, you notice dimming headlights, weak power windows, and unresponsive electronics. Shortly after, your Check Engine Light (CEL) turns on, and a scan with an OBD-II scanner reveals the P0562 fault code – System Voltage Low. What does this mean, and how do you fix it?

At AUTOTEK, we specialize in real-world diagnostics and expert vehicle troubleshooting. In this guide, we’ll explain why your Land Cruiser’s electrical system is malfunctioning, how to diagnose it, and the best way to fix it.

Understanding P0562 – System Voltage Low

The P0562 fault code indicates that the vehicle’s electrical system voltage is too low, which can lead to various electronic failures. This is often caused by a blown fusible link block, preventing the battery and alternator from supplying power to essential circuits.

Common Symptoms of a Blown Fusible Link in a Toyota Land Cruiser:

• Dimming or flickering headlights
• Sluggish power windows and locks
• Unresponsive infotainment system or climate control
• Weak engine start or intermittent stalling
• Battery warning light or charging system error
• Check Engine Light (CEL) activated

Related Electrical System Fault Codes

A malfunctioning fusible link block can trigger multiple diagnostic codes, including:

P0563 - System Voltage High

• The system voltage is too high, which may occur if the fusible link block is faulty or shorted.

P0620 - Generator Control Circuit Malfunction

• This suggests a charging system issue, possibly caused by a blown fusible link preventing proper alternator function.

P0657 - Actuator Supply Voltage "A" Circuit/Open

• A damaged fusible link can cut off voltage supply to key electrical actuators.

B2278 - Power Source Circuit Malfunction

• Indicates a failure in the power distribution system, which could be caused by a failed fusible link block.

B2780 - Power Source Circuit Open or Short

• If the fusible link is damaged, certain electrical circuits may not receive power.

U0140 - Lost Communication With Body Control Module (BCM)

• A failing fusible link block can disrupt power to the BCM, causing a communication failure.

If any of these codes appear, your fusible link block may need to be replaced.

Step-by-Step Diagnosis of P0562 in a Toyota Land Cruiser

Before replacing the fusible link block, follow these diagnostic steps:

Step 1: Scan for Fault Codes

• Use an OBD-II scanner to confirm P0562 or related electrical system codes.
• If additional codes like P0620 or B2780 appear, it indicates a serious power supply issue.

Step 2: Inspect the Fusible Link Block & Wiring

• Locate the fusible link block in the engine bay fuse box.
• Check for burnt, melted, or corroded fuses and wiring.

Step 3: Test the Battery Voltage

• Using a multimeter, check the battery voltage:
  • Engine off: Voltage should be between 12.4V - 12.6V.
  • Engine running: Voltage should be between 13.8V - 14.5V.
• If voltage is below 12V, the alternator or fusible link may be faulty.

Step 4: Test the Alternator Output

• With the engine running, test the alternator output at the battery terminals.
• If the alternator is not producing adequate voltage, it may be due to a faulty fusible link blocking power flow.

Step 5: Reset the Fault Code & Test Drive

• Clear the P0562 code using an OBD-II scanner.
• Start the engine and monitor electrical functions (headlights, power windows, dashboard lights).
• Take the vehicle for a test drive to check if the warning lights return.
• If the code reappears, the fusible link block likely needs replacement.

Recommended Fix for Toyota Land Cruiser P0562 Code

If diagnosing the system confirms a faulty fusible link block, the best solution is to replace it.

✅ Recommended Replacement Part: Fusible Link Block - Toyota Land Cruiser (2013-2016) - 82620-60100

Replacement Procedure:

1. Disconnect the battery to prevent electrical shorts.
2. Open the engine bay fuse box to access the fusible link block.
3. Remove the damaged fusible link block by unscrewing the mounting bolts.
4. Install the new fusible link block and secure all connections.
5. Reconnect the battery and clear any stored fault codes.
6. Start the vehicle and test electrical components.
7. Monitor the voltage to ensure stable power distribution.

Similar Fault Codes & Reference

If your vehicle displays additional electrical system-related codes, here’s how they compare:

• P0563 – System Voltage High
• P0620 – Generator Control Circuit Malfunction
• P0657 – Actuator Supply Voltage "A" Circuit/Open
• B2278 – Power Source Circuit Malfunction
• B2780 – Power Source Circuit Open or Short
• U0140 – Lost Communication With Body Control Module (BCM)

These codes all point to electrical power distribution issues, which can often be resolved by replacing a faulty fusible link block.

Conclusion

The P0562 fault code in a 2013-2016 Toyota Land Cruiser 5.7L V8 is usually caused by a blown fusible link block, leading to voltage drops, electrical failures, and potential stalling. Replacing the faulty fusible link block can restore proper power distribution and prevent further electrical damage.

If you’re experiencing this issue, consider replacing the fusible link block, available on AUTOTEK. Need expert guidance? Contact us for professional support.

Need More Help?

If you have any questions or need further assistance, our team at AUTOTEK is here to help! Leave a comment below or contact us directly.